chyptogams 



1911 



become separate individuals. The plant is attaclied to the 

 ground by absorptive liairs, or rlil?.oids. Al.)o\e, the sur- 



On 



;^34. Marcliuuliu : A, tlialliis with rliizoiils (c), cnimli'S fc). nml areliegoiiial 

 braiu'h (/)) ; B, seclioii of ar<::h<\2;'iiiinm, tlie Icrtilized e,L;i;' iy) liaviiig 

 divMi'il (Jiii-e; C ilisk of fruiliiii; l]rani-li unt ti. sliow s|iiirn!4(iina 

 (m,ii.<>)\ I), o|ifMii'(f spdi-ou-iuiiiim witli i>iivelopirig sliealU (/"'), and 

 remains of old archf^niiiniii {((/■). 



face is seen on close inspection to be divided into small, 

 slightly raised areas, each with a pore at the summit. 

 The pore leads into a chamber (Fig. 335), from the floor of 

 which rise short fila- 

 ments or rows of richly 

 chloropliyllous cells — 

 the chief assimilatory 

 tissue. Tills arrange- 

 ment has the same ef- 

 fect as that of the loose 

 tissues in the leaf of 

 Flowering Plants (see 

 Fig. 382 ), where pores (stomates) give free passage to gases, 

 while the epidermal covering retains moisture. 



335. Section in iippei- part of tliailns tn 

 sliow pore (p) and assimilating cells 

 (oc). 



